KR101997942B1 - Coated article with low-e coating having absorbing layer over functional layer designed to increase outside reflectance - Google Patents

Abstract

The coated product includes a low-E coating in which an absorbing layer is disposed on the functional layer (IR reflective layer), and the coating is designed to have an increased external reflectance (e.g., external reflectivity in the IG window unit) and good selectivity . In a particular embodiment, the absorber layer is metallic or substantially metallic and is located on top of and directly in contact with the lower IR reflective layer of the two IR reflective layers. In certain exemplary embodiments, a nitride-based layer (e.g., silicon nitride or the like) is deposited on the surface of the absorber layer to reduce or prevent oxidation of the absorber layer during thermal processing (e.g., thermal tempering, thermal bending, and / By locating and contacting directly, predictable coloration, high external reflectivity, and / or good selectivity can be achieved. The coated product in accordance with certain exemplary embodiments of the present invention may be used in connection with an insulating glass (IG) window unit, a vehicle window, any other type of window, or any other suitable use.

Description

[0001] COATED ARTICLE WITH LOW-E COATING HAVING ABSORBING LAYER OVERFUNCTIONAL LAYER DESIGNED TO INCREASE OUTSIDE REFLECTANCE [0002] FIELD OF THE INVENTION [0001] The present invention relates to a coated product comprising a low-E coating having an absorbent layer on the functional layer,

The present invention relates to a coated article comprising a low-emissivity coating. In certain exemplary embodiments, the absorber layer of a low-E coating is positioned on top of the functional layer (IR reflective layer) to provide an increased outside reflectance (e.g., external reflectivity in the IG window unit) and / (For example, glass-side reflectance measured by monolithic), and good selectivity. In certain exemplary embodiments, the absorber layer is metallic or substantially metallic and is located on top of and directly in contact with the bottom of the two IR reflective layers. In certain exemplary embodiments, a nitride-based layer (e.g., silicon nitride or the like) may be used to reduce or prevent oxidation of the absorbent layer during heat treatment (e.g. thermal tempering, thermal bending, and / , Located directly on top of the absorbent layer and in direct contact, after heat treatment, predictable coloration, high external reflectivity, and / or good selectivity can be achieved. The coated product in accordance with certain exemplary embodiments of the present invention may be used in connection with an insulating glass (IG) window unit, a vehicle window, any other type of window, or any other suitable use.

It is known in the art that coated products are used in window applications such as insulating glass (IG) window units, vehicle windows, and the like. In a particular example, it is known that for the purposes of tempering, bending, etc., it is desirable to heat treat such a coated article (e.g., thermal tempering, thermal bending and / or thermal stretching).

In certain instances, designers of coated products often attempt to combine high outside reflectance for aesthetic purposes, with good selectivity, good visible light transmittance, low emissivity (or degree of emissivity) and low sheet resistance (Rs) . These coated products, due to their low emissivity (low-E) and low sheet resistance characteristics, can prevent a significant amount of IR radiation and, for example, reduce undesirable heating of the vehicle or building interior. Generally, however, the heat treatment of the coated product requires at least 580 캜, preferably at least about 600 캜, and more preferably at least 620 캜. Use at such high temperatures (e.g., for 5 minutes to 10 minutes or more) often results in coating failure, undesirably low external visible light reflectance, and / or one or more of the above desirable characteristics undesirably deteriorating significantly do.

U.S. Patent Publication No. 2005/0202254 (incorporated herein by reference) discloses a coated article having, on a glass substrate, outwardly from a glass substrate, the following layers:

layer

Glass substrate

TiO ₂

Si ₃ N ₄

ZnO

Ag

NiCrO _x

SnO ₂

Si ₃ N ₄

SnO ₂

ZnO

Ag

NiCrO _x

SnO ₂

Si ₃ N ₄

Although the coated product is heat treatable and has many desirable and preferred features, there is a problem with undesirably low external visible light reflectivity when the coated product is used in an IG window unit. In particular, U.S. Patent No. 2005/0202254 discloses that an IG window unit with a coating can realize visible light reflectance on the outer glass side of only 1 to 12%.

As yet another example, the coated article of U.S. Patent No. 8,017,243 has a number of desirable and preferred features, but has problems with respect to undesirably low outside or glass side reflected visible light reflectance. In particular, in the table of U.S. Patent No. 8,017,243, an IG window unit with a coating is shown to be able to achieve an outside glass side reflectance of only 1 to 14% (see R _g Y value).

In another example, the coated article of U.S. Patent No. 7,419,725 has a number of desirable and preferred features, but has problems with respect to undesirably low outside or glass side reflected visible light reflectance. In particular, in Examples 1 and 2 of U.S. Patent No. 7,419,725, an IG window unit with a coating appears to realize an outer glass side visible light reflectance of only 16.9 to 17.7%.

In this regard, those skilled in the art will appreciate that coated products having many desirable optical characteristics (e.g., high emissivity and high visible-light transmittance, as well as high outside-glass-side visible light reflectivity in the IG window unit) You know.

The present invention relates to a coated article comprising a low-E coating. In certain exemplary embodiments, the absorber layer of a low-E coating is located on top of the functional layer (IR reflective layer), and the coating has a desired visible light transmittance, selectivity, low solar heat gain co-efficient (SHGC) (E.g., visible light reflectance outside in the IG window unit) and / or increased glass-side visible light reflectance (e.g., monolithically measured glass-side visible light reflectance) . In certain exemplary embodiments, the absorber layer is metallic or substantially metallic and is located on top of and directly in contact with the bottom of the two IR reflective layers. In certain exemplary embodiments, the thickness of the metallic or substantially metallic absorbing layer (e.g., NiCr) is from about 25 to about 50 Angstroms. Surprisingly, it has been found that this increases the outside visible light reflectance and / or the monolithically measured glass side visible light reflectance in IG window unit applications while maintaining the desired visible light transmittance and low emissivity. In certain exemplary embodiments, a nitride-based layer (e.g., silicon nitride or the like) may be deposited on the absorbing layer (e.g., silicon nitride) to reduce or prevent oxidation of the absorbing layer during heat treatment (e.g., thermal tempering, thermal bending, and / In direct contact with the substrate, after heat treatment, predictable coloration, high external reflectivity, and / or good selectivity can be achieved. The coated product in accordance with certain exemplary embodiments of the present invention may be used in connection with an insulating glass (IG) window unit, a vehicle window, any other type of window, or any other suitable use.

In a particular example embodiment of the present invention, there is provided a coated article comprising a coating supported by a glass substrate,

The first IR reflective layer and the second IR reflective layer, which contain silver, are located closer to the glass substrate than the second IR reflective layer, and the first IR reflective layer, which contains silver, is located on top of the first zinc reflective layer Located in direct contact with;

A substantially metallic adsorbent layer positioned over and in direct contact with the first IR reflective layer;

A nitride-containing layer positioned on and in direct contact with the substantially metallic absorbing layer;

A metal oxide-containing layer located on top of the nitride-containing layer; And

At least one dielectric layer located on top of the second IR reflective layer,

/ RTI >

The coating has a sheet resistance of 3.0 ohms / square or less, and the monolithically coated coated product has a visible light transmittance of about 20 to 70% and a glass side visible light reflectance of at least 20%. In certain exemplary embodiments, the coated article may be heat treated (e.g., thermal tempering to allow tempering to occur if the coating is on a glass substrate). In certain exemplary embodiments, the coated product may be provided in an IG window unit.

1 is a cross-sectional view of a coated article according to an exemplary embodiment of the present invention.
2 is a cross-sectional view of an IG unit according to an exemplary embodiment of the present invention.

The coated product herein may be used for a number of applications, such as an IG window unit, a vehicle window, a window of a monolithic building, a window of a residential space, and / or any other suitable use including one or more glass substrates Lt; / RTI >

In a particular example embodiment of the invention, the coating comprises a double-silver stack, but the invention is not limited by all these examples.

For example, in certain exemplary embodiments of the present invention, a heat treated (HT) coated article and / or a non-heat treated (" coated ") article having multiple IR reflective layers HT) coated product can realize a sheet resistance (Rs) of 3.0 or less (preferably 2.5 or less, more preferably 2.0 or less, and most preferably 1.7 or less). In certain exemplary embodiments, the coated product described herein, measured in monolithic form, before and / or after heat treatment (HT), has a visible light transmittance (Ill. C, 2 degree) of about 20 to 70% About 30 to 60%, more preferably about 35 to 55%, and most preferably about 40 to 50%. Further, in a particular example embodiment (heat treatment or non-heat treatment), when the coated product is coupled to another glass substrate to form an IG window unit, the IG window unit coated product according to the particular exemplary embodiment of the present invention Can achieve a visible light transmittance of about 20 to 70%, preferably about 30 to 60%, more preferably about 35 to 55%, most preferably about 40 to 50%, and most preferably about 41 to 46% . In certain exemplary embodiments, the glass side visible light reflectance (R _g Y%), measured in a monolithic form after and / or before the heat treatment, is significantly higher than the film side visible light reflectance (R _f Y%) At least about 5%, preferably at least about 10 or 15%). For example, if the glass side visible light reflectance is 24% and the film side visible light reflectance is 12%, the glass side visible light reflectance is 12% higher than the film side visible light reflectance (24% -12% = 12%). In a specific example embodiment of the present invention, after the heat treatment and / or before, the coating product described herein, measured in monolithic form is at least 20% of the glass side visible light reflectance (R _g Y%), preferably 20 to 50%, more preferably about 20 to 40%, more preferably 20 to 35%, still more preferably 22 to 35%, and most preferably 24 to 30%. Further, in a particular example embodiment (heat treatment or non-heat treatment), when the coated product is coupled to another glass substrate to form an IG window unit, the IG window unit coated product according to the particular exemplary embodiment of the present invention Preferably has a glass side visible light reflectance (R _g Y%) of at least 20%, preferably about 20 to 50%, more preferably 20 to 40%, more preferably 20 to 35%, even more preferably 22 to 35% Even more preferably from 23 to 30%, even more preferably from 24 to 29% and most preferably from about 25 to 27%). In certain exemplary embodiments, by coating, the IG unit may have an SHGC of less than 0.27, preferably less than 0.25, and most preferably less than 0.24, in combination with any of the embodiments described herein.

&Quot; Heat treatment "and" heat treating " as used herein means heating the coated article to a temperature sufficient to achieve thermal tempering, heat bending, and / or thermal stretching of the glass-containing article. This definition includes heating the coated product for a period of time sufficient to thermally temper, bend, and / or heat stretch in an oven or furnace at a temperature of, for example, at least about 580 占 폚, preferably 600 占 폚 . In a particular example, HT can be conducted for at least about 4 to 5 minutes. In another embodiment of the present invention, the coated article may not be heat treated.

1 is a side cross-sectional view of a coated article according to a non-limiting embodiment of the present invention. The coated article may be a transparent substrate having a thickness of about 1.0 to 10.0 mm, preferably about 1.0 to 7.0 mm, more preferably about 5 to 7 mm, and an exemplary thickness of about 6 mm, E (or layer system) 30 that is provided directly or indirectly on the substrate 1, and a low-E coating (or layer system) provided on the substrate 1. The coating (or layer system) 30 may be, for example, Si-rich form Si ₃ N ₄ for haze reduction (which may or may not be doped with other materials such as aluminum in certain examples) The silicon nitride-based and / or silicon nitride-containing layer 3 of the bottom dielectric, which may be any other suitable stoichiometric silicon nitride in another embodiment of the first bottom dielectric, ), A first conductive (preferably metallic) infrared (IR) reflective layer 9, a metallic or substantially metallic adsorbent layer 4 that is located on top of and directly in contact with the IR reflective layer 9 , NiCr, or the like), a silicon nitride-based and / or silicon nitride-containing layer 14 of dielectric directly overlying and in contact with the top of the absorber layer 4, tin oxide- Containing inner layer 15, a second bottom dielectric < RTI ID = 0.0 > A layer 17 (which is in contact with the IR reflective layer 19), a second conductive (preferably metallic IR reflective layer 19), an upper contact layer 21 (in contact with the IR reflective layer 19) ), And finally a protective dielectric layer (25). The "contact" layers 7, 17, 21 each contact at least one IR reflective layer (eg, an Ag-based layer). The layers 3 to 25 constituting the low-E (i.e., low emissivity) coating 30 are provided on a glass or plastic substrate 1. [ Between in certain example embodiments, the lower IR reflecting layer 9 and the glass substrate 1, a dielectric, a high index layer (for example, TiO ₂ layer) is not present ( "high index layer" is the refractive index n Which means a layer higher than about 2.15).

In a specific exemplary embodiment, a method for solving the problem is one in which the difference between the glass side reflectance (R _g Y) and the film side reflectance (R _f Y) is large after the heat treatment (e.g. thermal tempering) To form a coating. Generally, when using a dual silver coating design, the difference between the glass side reflectance and the film side reflectance is small. In certain markets, such as certain parts of the market, this big difference is aesthetically pleasing. Thus, in a specific example embodiment of the present invention, the coated product is designed to have a high, mirror-like, glass-side visible light reflectance while maintaining low film side visible light reflectance. Conventionally, some single silver coatings have made this possible, but certain exemplary embodiments of the present invention relate to a number of silver coatings that make this feasible. The drawback of this single silver coating tends to have a somewhat higher solar thermal gain coefficient (SHGC) of 0.29, and a high solar load can not meet the proposed energy code standard (SHGC <0.25). Certain exemplary embodiments of the invention maintain the aesthetics of the high reflection differences discussed herein, while the SHGC meets the energy code specification by providing about 0.23. In certain exemplary embodiments of the present invention, a high R _g Y / R _f Y difference can be achieved after heat treatment, using a metallic or substantially metallic NiCr absorber layer instead of a "transparent" NiCrO _x layer on top of the underlying silver. In certain exemplary embodiments, a nitride layer, such as silicon nitride, is disposed directly on the NiCr absorbing layer to avoid significant oxidation of the underlying NiCr to the NiCrOx during the heating process. Also, in certain exemplary embodiments, a small amount of nitrogen (50 mL) can be introduced directly into the lower absorber layer in the silver top, in order to reduce or reduce the haze delivered during heating and maintain optical properties. Nitrogen has little effect on the intermediate optical properties of NiCr, but it can remain metallic or substantially metallic during heating.

In the monolithic example, the coated product includes only one glass substrate 1 as shown in Fig. However, the monolithic coated products described herein can be used in devices such as laminated vehicle shielding plates, IG window units, and the like. For the IG window unit, the IG window unit may comprise two spaced glass substrates. An example IG window unit is shown and described in U.S. Patent No. 7,189,458, the entire contents of which are incorporated by reference. The exemplary IG window unit includes, for example, the coated glass substrate 1 shown in Fig. 1 coupled to another glass substrate so as to have a defined gap through spacers, sealants, and the like. The gap between the substrates in the IG unit embodiment can be filled with a gas such as argon (Ar) in certain examples. Exemplary IG units include a pair of spaced apart transparent glass substrates each having a thickness of about 3 to 7 mm (e.g., 6 mm), and one of the two substrates is coated with a coating 30 in a particular example And the gap between the substrates may be about 5 mm to 30 mm, preferably 10 to 20 mm, more preferably about 12 mm. In a particular example, the coating 30 is applied to the inner surface of the outer glass substrate 1 as shown in FIG. 2, although in the preferred embodiment the coating 30 is provided on the inner surface of the two substrates facing the gap / RTI &gt; An exemplary IG window unit is shown in Fig. 2, for example, such that the coated glass substrate 1 shown in Fig. 1 has a gap defined by a spacer, a sealant, etc. (4) Lt; / RTI &gt; In a particular example, in the IG unit embodiment, the gap 6 between the substrates may be filled with a gas such as argon (Ar). In another embodiment of the present invention, the gap 6 may or may not be present at a pressure below atmospheric pressure.

Referring again to Figure 2, in a particular example, the exemplary IG unit includes a pair of spaced glass substrates 1 and 2, each with a substrate thickness of 6 mm, And the gap 6 between the substrates may be about 5 to 30 mm, preferably about 10 to 20 mm, and most preferably about 12 to 16 mm. In a particular exemplary embodiment, the coating 30 is provided on the inner surface (i.e., surface # 2 from the outside) of the outer glass substrate 1 shown in Figure 2, May be provided on the substrate 2.

In a particular exemplary embodiment of the present invention, the absorber layer 4 is located directly on top of the underlying IR reflective layer 9 and is in direct contact. In a particular exemplary embodiment, the nitride layer 14 located on and directly in contact with the absorber layer is a nitride-based layer and is not substantially or entirely oxidized. This helps to prevent (or reduce the likelihood) that the absorbent layer is oxidized during the heat treatment, so that the absorbent layer performs one of its intended functions, especially at least some amount of visible light (e.g., at least 5% More preferably at least 10%). If the absorbent layer is too oxidized during the heat treatment, it can be seen that it no longer functions as an appropriate absorbent layer.

In certain exemplary embodiments of the present invention, the absorbent layer 4 may be or include Ni and / or Cr (e.g., NiCr having any suitable ratio of NiCr). In certain exemplary embodiments, the absorbent layer 4 preferably comprises 0 to 10% oxygen, preferably 0 to 5% oxygen, and most preferably 0 to 2% (atomic%) oxygen. In addition, 0 to 20% nitrogen, preferably 1 to 15% nitrogen, and most preferably 1 to 10% nitrogen (atomic%) can be provided in the absorbent layer 4. NiCr (e.g., in certain exemplary embodiments, the nitride, as the case may be) is the preferred material for the absorber layer 4, but instead of or in addition to Ni and / or Cr another material may be used. For example, in the specific example embodiment of the invention, the absorption layer (4) is either such as Ni, Cr, NiCrN _x, CrN, ZrN may include them. In a non-heat treatable embodiment, the material can be used for the absorbing / absorbing layer 4, as well as for other materials such as Ti, Zr, NiOx, and the like.

The absorbent layer 4 of the low-E coating can be applied to the outer surface of the coated and / or coated product (including the IG unit in certain embodiments) with an increased visible light transmittance, selectivity, low SHGC, And / or glass side) visible light reflectance (e.g., IG window unit). In a particular exemplary embodiment, the metallic or substantially metallic absorbing layer (e.g., NiCr) 4 is thinner than the top contact layer 21 and has a thickness of about 25 to 80 Angstroms, preferably 25 to 50 Angstroms , More preferably about 30 to 40, and most preferably about 33 to 37 (e.g., about 35 Angstroms). Also, in certain exemplary embodiments, the top contact layer 21 is significantly oxidized (e.g., at least about 50% oxidized) while the absorbent layer 4 is metallic or only slightly oxidized. Thus, the absorbent layer 4 functions as an absorbent layer, which surprisingly increases the outer or glass-side reflectance of the coated product significantly, while the upper contact layer 21 does not function as an absorbent layer.

In certain exemplary embodiments, the metallic or substantially metallic adsorbent layer 4 may be used to reduce or prevent oxidation of the absorbent layer 4 during thermal processing (e.g., thermal tempering, thermal bending, and / or thermal expansion) , The metallic or substantially metallic IR reflecting layer 9 and the nitride layer 14 are in direct contact with each other so that the reflectance and visible light transmittance can be achieved after the heat treatment (HR).

In addition, in certain exemplary embodiments, the metal oxide-based and / or metal oxide-containing layer 15, which may be tin oxide or tin oxide, may include nitride-based layer 14 and upper infrared (IR) Based layer 14 and the tin oxide-based and / or tin oxide-containing contact layer 17, in particular in a particular example. For example, it has been found that such a tin oxide-containing inner layer 15 can be used to produce a coated product that can achieve the desired optical characteristics.

In certain embodiments of the present invention, the dielectric layers 3, 14, and 25 may be silicon nitride or silicon nitride. The silicon nitride layers 3, 14 and 25 can improve the heat treatment potential of the coated product, for example, thermal tempering and the like. The silicon nitride of this layer may be in stoichiometric form (i.e., Si ₃ N ₄ ), or may be a Si-rich layer in other embodiments of the present invention. For example, the Si-rich silicon nitride 3 (and / or 14) that binds to the zinc oxide and / or tin oxide in the lower portion of the silicon-based IR reflective layer, Silver may be deposited (e.g., deposited via sputtering, etc.) in a manner that reduces sheet resistance. In addition, the free Si (Si) present in the Si-rich silicon nitride-containing layer 3 has the advantage that certain valencies such as sodium (Na) migrating out of the glass 1 during HT reach and damage Previously, certain atoms can be efficiently protected by a Si-rich silicon nitride-containing layer. Thus, in certain exemplary embodiments of the present invention, it can be seen that the Si-rich Si _x N _y can reduce the amount of silver layer damaged during the HT, thereby reducing or maintaining the sheet resistance Rs at a satisfactory level . It is also noted that, in an alternative embodiment of the specific example of the present invention, the Si-rich Si _x N _y in layer 3 helps to reduce the amount of absorbing layer 4 that is damaged (e.g., oxidized) in the HT . In a particular exemplary embodiment, when Si-rich silicon nitride is used in layers 3 and / or 14, the deposited Si-rich silicon nitride layer is characterized by a Si _x N _y layer, x / y ranging from 0.76 to 1.5 , More preferably from 0.8 to 1.4, and still more preferably from 0.85 to 1.2. Further, in certain exemplary embodiments, before and after HT, the Si-rich Si _x N _y layer has a refractive index n of at least 2.05, preferably at least 2.07, and optionally at least 2.10 (e.g., 632 nm) The stoichiometric Si ₃ N ₄ that can be used has a refractive index n of 2.02 to 2.04). In certain exemplary embodiments, the improved thermal stability is particularly surprising, especially when the refractive index "n" of the deposited Si-rich Si _x N _y layer is at least 2.10, preferably at least 2.20, and most preferably 2.2 to 2.4 It can be seen that it is feasible.

In certain exemplary embodiments of the present invention, some or all of the silicon nitride layers discussed herein may be doped with other materials such as stainless steel or aluminum. For example, some and / or all of the silicon nitride layers discussed herein (e.g., 3, 14, and / or 25) , Preferably about 1 to 10% aluminum. Silicon nitride may be deposited by sputtering a target Si or SiAl in a particular embodiment of the present invention. Also in certain instances, oxygen may be provided in one or more silicon nitride layers. Since the silicon nitride layer 14 is provided to prevent the oxidation of the absorber layer 4 in the HT, in a particular example embodiment, the silicon nitride-based layer 14 is formed of one of the silicon nitride-based layers 3 and 25 Or both, at least about 50 Angstroms thinner, preferably at least about 100 Angstroms thinner. Based layer 14 is at least about 100 angstroms thinner than the silicon nitride-based layer 25 and at least about 50 angstroms thinner than the silicon nitride-based layer 3. In certain exemplary embodiments, the silicon nitride- In a particular example embodiment of the present invention, silicon nitride is the preferred material for layers 3, 14, and 25, but in yet another embodiment of the present invention, instead of or in addition to silicon nitride, Lt; / RTI &gt; layer.

The infrared reflective layers 9 and 19 preferably comprise substantially or entirely metallic and / or conductive and may comprise or consist essentially of silver (Ag), gold, or any other suitable IR reflective material. The IR reflective layers 9 and 19 help the coating to have low-E and / or good sun control characteristics. However, in certain embodiments of the invention, the IR reflective layer may be slightly oxidized. In a particular example embodiment, the top IR reflective layer 19 is thicker than the underlying IR reflective layer 9 (e.g., at least about 5 Angstroms thick, preferably at least about 10-15 Angstroms thick).

In a particular example embodiment of the present invention, the top contact layer 21 may be formed of a material selected from the group consisting of nickel (Ni) oxide, chromium / chromium (Cr) oxide, or nickel alloy oxide, such as nickel chromium oxide (NiCrOx) Materials, or the like. For example, if NiCrO _x is used in the layer 21, the durability can be improved. NiCrO _x layer 21 may be oxidized or oxidized fully (or substantially fully in) in a particular embodiment of the invention only a portion. In a particular example, the NiCrO _x layer 21 may be at least about 50% oxidized. In another embodiment of the present invention, the contact layer 21 (e.g., or including an oxide of Ni and / or Cr) may be oxidatively graded or not oxidized. The oxidation gradient can be controlled by changing the layer thickness by the degree of oxidation of the layer and by controlling the thickness of the interface with the IR reflection layer 19 that is in direct contact with the IR reflection layer 19 directly adjacent to a portion of the farther or further / Lt; RTI ID = 0.0 &gt; less &lt; / RTI &gt; In another embodiment of the present invention, the contact layer 21 (e.g., an oxide of Ni and / or Cr, or an oxide of Ni and / or Cr) is substantially continuous in the entire IR reflective layer 19 Or it may not be continuous.

In a particular example embodiment of the present invention, the dielectric layer 15 may be tin oxide or tin oxide. However, in other examples, other materials may be used in combination with the other layers described herein.

In a particular embodiment of the present invention, the bottom contact layer 7 and / or 17 may be or comprise zinc oxide (e. G., ZnO). The zinc oxide layers 7 and 17 may contain other materials, for example Al (for forming ZnAlOx, for example) and / or tin. For example, in certain exemplary embodiments of the present invention, the one or more zinc oxide-based layers 7 and 17 comprise about 1 to 10% Al, preferably about 1 to 5% Al, most preferably about 1 to 4% Al. &Lt; / RTI &gt;

In a particular example embodiment of the present invention, the dielectric layer 23 may be or comprise tin oxide. The dielectric layer 23, like the other layers of the coating, need not be provided selectively in the specific example embodiments of the present invention. The dielectric layer 25, which may be overcoated in a particular example, may be silicon nitride (e.g., Si ₃ N ₄ ) or silicon nitride, or may be any other suitable material in the exemplary embodiment of the present invention . Alternatively, other layers (e. G., A layer comprising or comprising zirconium oxide) may be provided on layer 25. Layer 25 is provided for durability purposes and is provided to protect the underlying layer during heat treatment and / or environmental use. In a particular exemplary embodiment, layer 25 may have a refractive index n of about 1.9 to 2.2, preferably about 1.95 to 2.05.

Other layers may also be provided on top or bottom of the illustrated coating. Thus, even if a layer system or coating is "supported" (directly or indirectly) on the substrate 1 or on the substrate 1, another layer can be provided therebetween. 1 is supported by " on substrate 1 "or " on substrate 1 &quot;, even though other layers are provided between layer 3 and substrate 1. [ . Also, in certain embodiments, certain layers of the illustrated coating may be removed, but in other exemplary embodiments, other unillustrated layers may be added between the various layers without departing from the overall idea of the invention Or in other embodiments of the present invention, the various layers may be decomposed and other layers may be added between the decomposed regions.

Although various thicknesses and materials are used in the layer in different embodiments of the present invention, the thickness and material of the example for each sputter deposited layer from the glass substrate to the glass substrate 1 in the Fig. Is as follows:

In certain exemplary embodiments of the present invention, the coated article described herein may have the following optical and solar characteristics as listed in Table 2, when measured as monolithic (before any optional HT). Relative optics are described in Ill. C, 2 °, but note that L * is the Hunter value (C 2 ° but note that L * values are Hunter). The sheet resistance R _s described herein considers all IR reflective layers (e.g. silver-based layer 9.19).

Further, in the specific example of the present invention, the coated product described herein, which may optionally be heat-treated to a degree sufficient for tempering and coupled to another glass substrate to form an IG unit, may comprise the following IG unit optical / Lt; / RTI &gt; When the coating 30 is on surface # 2 of the IG window unit shown in FIG. 2, the outside visible light reflectance of the IG window unit is represented by R _g Y in the following table.

Further, in certain exemplary embodiments, the coated article is thermally stable at a heat treatment (e.g., thermal tempering), and when measured monolithically, the glass side reflectance? E * value due to HT is less than or equal to about 5.0, To about 4.5 or less.

The following examples are provided for the purpose of illustration and not of limitation, unless otherwise specified.

Example

The following Example 1 was carried out by sputtering so as to have a layer described below on a transparent glass substrate having a thickness of 6 mm. Embodiment 1 is according to an exemplary embodiment of the present invention shown in Fig. Example 1 has the following layer stack, the thickness being in Angstrom units.

Example 1 was calculated to have approximately the following characteristics, which were measured by heat tempering and post-HT monolith.

The tempered and coated substrate of Example 1 is coupled to another 6 mm clear glass substrate with a 12 mm gap to form the IG window unit shown in FIG. 2, and is simulated to have approximately the following characteristics.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Any of the embodiments described herein may be used with or without any other embodiment described herein.

Claims (29)

CLAIMS What is claimed is: 1. A coated product comprising a coating supported by a glass substrate,
A first silicon nitride containing layer supported by said glass substrate;
A first zinc oxide-containing layer supported by the glass substrate and positioned on top of the first silicon nitride-containing layer and in direct contact with the first silicon nitride-containing layer;
Wherein the first IR reflective layer is located closer to the glass substrate than the second IR reflective layer and the first IR reflective layer comprising silver comprises a first IR reflective layer and a second IR reflective layer, A top layer of zinc oxide-containing layer and in direct contact with said first zinc oxide-containing layer;
An absorber layer disposed on the first IR reflective layer and in direct contact with the first IR reflective layer, the absorber layer comprising any one of Ni and Cr;
A second silicon nitride containing layer located on top of the metallic absorbing layer and in direct contact with the metallic absorbing layer;
A metal oxide containing layer located on top of the second silicon nitride containing layer and in direct contact with the second silicon nitride containing layer;
A second zinc oxide-containing layer disposed below the second IR reflective layer and in direct contact with the second IR reflective layer, the second zinc oxide-containing layer positioned above the metal oxide containing layer; And
At least one dielectric layer positioned over the second IR reflective layer,
/ RTI &gt;
Wherein the coating has a sheet resistance of 3.0 ohms / square or less and the coated product has a visible light transmittance of 20% to 70% and a glass side visible light reflectance of at least 20% as measured by monolithic, Wherein the coated product comprises a coating that is supported by a glass substrate at least 5% higher than the film side visible light reflectance of the coated product.
The method according to claim 1,
A high index layer having a refractive index n of greater than 2.15 is not located between the first IR reflective layer and the glass substrate.
3. The method according to claim 1 or 2,
Wherein the coated product has a visible light transmittance of 35% to 55% as measured by a monolithic method.
3. The method according to claim 1 or 2,
Wherein the coated product has a glass side visible light reflectance of 20% to 50% as measured by a monolithic method.
3. The method according to claim 1 or 2,
Wherein the coated product has a glass side visible light reflectance of 20% to 35% as measured by a monolithic method.
3. The method according to claim 1 or 2,
Wherein the coated product has a glass side visible light reflectance of from 24% to 30% as measured by a monolithic method.
3. The method according to claim 1 or 2,
Wherein the metallic absorbent layer is 25 to 50 Angstroms thick.
3. The method according to claim 1 or 2,
Wherein the coated product has a visible light transmittance of 30% to 60%.
3. The method according to claim 1 or 2,
Wherein the coated product has a visible light transmittance of 35% to 45%.
3. The method according to claim 1 or 2,
Wherein the absorbent layer comprises NiCr.
3. The method according to claim 1 or 2,
Wherein the coated article is heat treated.
3. The method according to claim 1 or 2,
Wherein the coated product is heat-tempered and the glass-side reflectance? E * value is less than or equal to 4.5 due to the tempering.
3. The method according to claim 1 or 2,
Wherein said second silicon nitride containing layer is at least about 50 angstroms thinner than said first silicon nitride containing layer.
3. The method according to claim 1 or 2,
Wherein the metal oxide is tin oxide.
3. The method according to claim 1 or 2,
Wherein at least one dielectric layer located on top of the second IR reflective layer comprises a third silicon nitride containing layer.
16. The method of claim 15,
Wherein the second silicon nitride-containing layer is at least 100 angstron thinner than the third silicon nitride-containing layer.
3. The method according to claim 1 or 2,
Wherein the second zinc oxide-containing layer is in direct contact with the metal oxide-containing layer.
An insulating glass (IG) window unit comprising a coated product as claimed in claim 1 or 2, wherein the coated product is connected in spaced relation to another glass substrate.
19. The method of claim 18,
Wherein the coating is located on an inner surface of the glass substrate closest to the sun and the IG window unit has an outer visible light reflectance of 23% to 30% and an SHGC of less than 0.25.
CLAIMS What is claimed is: 1. A coated product comprising a coating supported by a glass substrate,
A first IR reflective layer and a second IR reflective layer containing silver, the first IR reflective layer being located closer to the glass substrate than the second IR reflective layer, wherein the first IR reflective layer containing silver comprises a zinc oxide- And is in direct contact with the zinc oxide-containing layer;
A NiCr absorption layer located on top of the first IR reflection layer and in direct contact with the first IR reflection layer;
A nitride-containing layer located on top of the NiCr absorption layer and in direct contact with the NiCr absorption layer;
A metal oxide containing layer located on top of the nitride containing layer;
At least one dielectric layer located on top of the second IR reflective layer;
/ RTI &gt;
Wherein the coating has a sheet resistance of 3.0 ohms / square bar or less, and after the coated product is thermally tempered, the coated product has a visible light transmittance of 20% to 70% when measured monolithically, Is at least 20% and the glass side visible light reflectance is at least 5% higher than the film side visible light reflectance of the coated product.
21. The method of claim 20,
A high index layer having a refractive index n of greater than 2.15 is not located between the first IR reflective layer and the glass substrate.
22. The method according to claim 20 or 21,
Wherein the coated product has a glass side visible light reflectance of from 24% to 30% as measured by a monolithic method.
22. The method according to claim 20 or 21,
Wherein the NiCr absorption layer is 25 to 50 Angstroms thick.
22. The method according to claim 20 or 21,
Wherein the absorbent layer comprises a nitride of NiCr.
delete 22. The method according to claim 20 or 21,
Wherein the coated product is heat-tempered and the glass-side reflectance? E * value is less than or equal to 4.5 due to the tempering.
delete 22. The method according to claim 20 or 21,
Wherein the glass side visible light reflectance is at least 10% higher than the film side visible light reflectance of the coated product.
22. The method according to claim 20 or 21,
Wherein the glass side visible light reflectance is at least 15% higher than the film side visible light reflectance of the coated product.

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